Which process produces a continuous profile by forcing material through a shaped die?

• A. Casting
• B. Extrusion
• C. Forging
• D. Injection Moulding

Answer: (B)

Extrusion is the process that produces a continuous profile by forcing material through a shaped die. The die defines the cross‑section, so as material is pushed (or pulled) through, you get a long, endless length with that constant shape—think channels, tubes, rods, or wires. This works for metals, plastics, and other materials, and can be done hot or cold depending on the material.

Casting involves pouring liquid into a mold to create a fixed shape, so you get discrete pieces rather than a long continuous form. Forging shapes material by deforming it with dies, but typically results in individual components rather than an ongoing profile. Injection molding pushes molten material into a mold cavity to form finished parts, also discrete pieces rather than a continuous profile.